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Cushion|Lab Grown|IGI

1.78ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG833637805

Shape and cutting style on the report: Square cushion antique cut

Certificate IGI LG833637805

Diamond specifications and retailer prices

From £1,011 GBP
$1,355 USD
As of October 31, 2026
Save £2,151 GBP (68%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £3,162 GBP at Taylor and Hart · As of October 30, 2026
View at Taylor and Hart

About this 1.78ct lab-grown cushion diamond

This 1.78ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG833637805 or 833637805. Listed at 17 retailers as of October 30, 2026, with prices from £1,011 to £3,162, a £2,151 spread on the same certified stone. Taylor and Hart lists it at £3,162. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG833637805
Dimensions7.51 × 7.24 × 4.53 mm
L/W Ratio1.04
Girdle conditionFaceted
Culet sizeLarge
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.51 mm7.24 mm1.78 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG833637805
Side View
Table 50.0%Crown 36.3°Girdle: MED-STKPavilion 40.1°Culet: LargeDepth 62.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £1,311 GBP|Low: £672 GBP|High: £3,162 GBP|Avg: £2,027 GBP|-1.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Taylor and Hart
October 31, 2026
Retailer 3£1,011 GBP
Retailer 9£1,028 GBP
Retailer 10£1,202 GBP
Retailer 1£1,311 GBP
Retailer 6£1,549 GBP
Retailer 7£1,893 GBP
Retailer 5£2,433 GBP
Retailer 8£2,502 GBP
Retailer 2£2,906 GBP
Retailer 4£3,088 GBP
Taylor and Hart£3,162 GBP

40 data points across 11 retailers

17 retailers£1,011 GBP to £3,162 GBP

Retailer 1
-
£781 GBP
$1,046 USD
Price last confirmed 38 days ago
Retailer 2
-
£781 GBP
$1,046 USD
View
Price last confirmed 21 days ago
Retailer 3
-
£893 GBP
$1,197 USD
View
Price last confirmed 39 days ago
Retailer 4
-
£906 GBP
$1,214 USD
View
Price last confirmed 29 days ago
Retailer 5
-
£906 GBP
$1,214 USD
View
Price last confirmed 19 days ago
A
Retailer 6
-
£1,011 GBP
$1,355 USD
View
A
Retailer 7
-
£1,028 GBP
$1,377 USD
View
Final sale: no returns
A
Retailer 8
-
£1,202 GBP
$1,610 USD
View
B+
Retailer 9
-
£1,311 GBP
View
B+
Retailer 10
-
£1,549 GBP
$2,075 USD
View
Retailer 11
-
£1,698 GBP
$2,275 USD
View
Price last confirmed 24 days ago
B+
Retailer 12
-
£1,893 GBP
$2,536 USD
View
B
Retailer 13
-
£2,433 GBP
$3,260 USD
View
B
Retailer 14
-
£2,502 GBP
View
B
Retailer 15
-
£2,906 GBP
$3,894 USD
View
B
Retailer 16
-
£3,088 GBP
View
Most Expensive
B
Taylor and Hart
9GF9QRZ · Oct 30
£3,162 GBP
$4,237 USD
View
16 more retailers have this diamond
Prices start from £1,011 GBPSave up to £2,151 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.78ct Cushion
£1,011 GBP